CVE-2025-62783: 
Java vulnerability analysis and mitigation

CVE-2025-62783 is a moderate severity vulnerability affecting the GuiStorageElement component in the InventoryGui Maven package (de.themoep:inventorygui) version 1.6.1-SNAPSHOT. The vulnerability was discovered and reported by FaMa91 on April 2, 2025. The issue allows for item duplication in GUIs that use the GuiStorageElement component (GitHub Advisory).

The vulnerability manifests as a NullPointerException that occurs when double-clicking on items placed in multiple slots, leading to item duplication. The issue specifically triggers when attempting to invoke 'getUniqueId()' on a null player object. The vulnerability has a CVSS v3.1 score of 5.0 (Moderate) with the vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N, indicating network attack vector, low attack complexity, low privileges required, and no user interaction needed (GitHub Advisory).

The vulnerability affects any plugin using the GuiStorageElement component, potentially allowing unauthorized item duplication within the game inventory system. This could impact game economy and balance by allowing players to duplicate items unintentionally (GitHub Advisory).

A patch has been released in version 1.6.2-SNAPSHOT, which addresses the vulnerability. The fix was also backported to version 1.6.1-SNAPSHOT through commit 27a52ef. As a temporary workaround, administrators can avoid using the GuiStorageElement in GUIs until they can update to a patched version (GitHub Advisory).